ALDEC G2Smart Decanter

Shifting the benchmarksThe innovative Alfa Laval ALDEC G2 decanter centrifugedesign has shifted the accepted benchmarks for dewateringperformance, providing an improvement of as much as 30%compared with previous generations of decanter centrifuges.

This complete range features a compact, modular designwith all critical parts made of wear-resistant materials. Theresult is reliable, continuous operation and easy, trouble-freeprocess control.

Easy to operate, easy to get resultsThe outstanding features of the ALDEC G2 design make iteasy to accomplish a wide range of performance targets.

• More sludge treated, more efficiently• Greater processing capacity for any given equipment footprint• Better process control• High level of protection against erosion• Low maintenance costs• Low energy consumption• Low life cycle costs• Major savings on sludge disposal

Enhancement packagesIn some cases, the economics of sludge treatment operationcan require the addition of one or more special Alfa Lavalenhancement packages. You can select between:• enhanced dewatering package – achieve even greater cakedryness and lower sludge disposal costs.

• enhanced wear protection package – maintenance costscan be reduced still further by selecting more wear resistantmaterials. This in turn extends service intervals.

• enhanced serviceability package – features that save youtime by making both operation and maintenance easier.

• enhanced control packages – add-on control systems thatprovide additional functionality and varying degrees ofautomation.

How to contact Alfa LavalUp-to-date Alfa Laval contact details forall countries are always available on ourwebsite at www.alfalaval.com

PEE00027EN 0709 Alfa Laval reserves the right to change specifications without prior notification.

Flow rate

G-level

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G2 designCurrent technology

Fig. 1 Shifting dewatering performance parameters, all round.

Designation Max. Weight Bowl Other product and Typical Main Typical Back Back drivekg (lbs) Material liquid wetted parts drive Size kW (HP) drive Size kW (HP) control

ALDEC G2-40 2200 (4850) AISI 316 AISI 316 15-22 (20-30) 5.5 (7.5) VFDALDEC G2-50 2400 (5290) AISI 316 AISI 316 15-22 (20-30) 5.5 (7.5) VFDALDEC G2-60 3800 (8379) AISI 316 AISI 316 18.5-37 (25-50) 7.5 (10) VFDALDEC G2-70 4200 (9259) AISI 316 AISI 316 22-37 (30-50) 7.5 (10) VFDALDEC G2-80 5000 (11023) duplex stainless steel AISI 316 30-45 (40-60) 7.5/11 (10/15) VFDALDEC G2-95 4500 (9900) duplex stainless steel AISI 316 45-90 (60-125) 11/22 (15/30) VFDALDEC G2-100 7000 (15432) duplex stainless steel AISI 316 37-75 (50-100) 7.5/11 (10/15) VFDALDEC G2-115 6500 (14300) duplex stainless steel AISI 316 75-160 (100-200) 7.7/30 (20/40) VFDALDEC G2-120 13000 (28660) duplex stainless steel AISI 316 75-160 (100-250) 11/22 (15/30) VFDALDEC G2-130 13730 (30200) duplex stainless steel AISI 316 225 (300) 22 (30) VFDALDEC G2-140 18070 (39750) duplex stainless steel AISI 316 450 (600) 55 (75) VFD

Technical Data

ALDEC G2-130 7465 mm (295 inch)

ALDEC G2-140 7740 mm (306 inch)

Max.1973mm(78inch).

3365 mm (133 inch)

3795 mm (150 inch)

Working principleSeparation takes place in a horizontal cylindrical bowlequipped with a screw conveyor. The feed enters the bowlthrough a stationary inlet tube and is accelerated smoothly byan inlet rotor. Centrifugal forces cause sedimentation of thesolids on the wall of the bowl. The conveyor rotates in thesame direction as the bowl, but at a different speed, thusmoving the solids towards the conical end of the bowl.

The ALDEC G2 design enables the hydraulic pressure insidethe bowl to enhance scrolling through a narrow opening. Thismeans that only the very driest fraction of the sludge cakeleaves the bowl through the solids discharge openings intothe casing. Separation takes place along the total length ofthe cylindrical part of the bowl, and the clarified liquid leavesthe bowl by flowing over adjustable plate dams into the cas-ing.

Process optimizationThe ALDEC G2 decanter centrifuge can be adjusted to suitspecific requirements by varying• the bowl speed to ensure the exact G force required for themost efficient separation.

• the conveying speed for the best possible balance betweenliquid clarity and solids dryness.

• the pond depth in the bowl for the best possible balancebetween liquid clarity and solids dryness.

• the feed rate – the ALDEC G2 is designed to handle a widerange of flow rates.

DesignAlfa Laval designed the ALDEC G2 decanter centrifuge with afocus on performance, easy access, reliability and low noiselevels. The rotating assembly is supported on a compactwelded box beam frame with main bearings at both ends.The in-line main motor is flange- or foot mounted onto theunit with adjustable brackets for belt tension adjustment. Thebowl is driven at the conical end by an electric motor with aV-belt transmission.The bowl, conveyor, casing, inlet tube, outlets and other partsin contact with the process media are made of AISI 316 andduplex stainless steel.

Direct driveThe drive system that is an integral part of the ALDEC G2design was specially developed by Alfa Laval to make it pos-sible to control the conveying speed automatically. Thisensures the best possible balance between liquid clarity andsolids dryness, irrespective of any variations in the feed flowthat may occur.

Dimensions

845 mm (33 inch)ALDEC G2-40 3955 mm (156 inch)

ALDEC G2-50 4255 mm (168 inch)

Max.1400mm(55inch)

ALDEC G2-95 5462 mm (215 inch)

ALDEC G2-115 6402 mm (253 inch)

1150 mm (46 inch)

1450mm (58 inch)

The Direct Drive system comprises an exceptionally efficientgearbox and variable frequency drive, which together avoidexposing the bowl drive to parasitic braking power. It alsosimplifies the electrical installation and keeps power con-sumption and CO2 emissions to the absolute minimum.In addition, the Direct Drive is capable of accurate controlwithin the complete range of differentials, with no need forchanging belts or pulleys.

Control systemsAlfa Laval provides a wide selection of control solutions foruse with the ALDEC G2 decanter centrifuges, ranging frombasic starter panels to completely automated dewateringcontrol systems.

Each ALDEC G2 unit is equipped with the G2 Core Controlleras standard. The G2 Core Controller controls the actions ofthe Direct Drive so that its running conditions correspondexactly to the solids load in the bowl. The G2 Core Controlleralso monitors a wide range of parameters related to the run-ning of the decanter centrifuge in order to ensure easy, safeand reliable operation – even when performing at maximumlevels. Operating staff have full access to process, mainte-nance and historical information via a colour screen.Additional performance-enhancing packages are also avail-able for the control systems. These range from extensiveprocess optimization using the Octopus system for devicemanagement to the Cosmos predictive maintenance systemfor in-depth analyses of maintenance needs, designed to pre-vent any potential breakdowns.

DD GearboxLiquid

Screw conveyor

Wall of the bowl

Inlet distributor

Conical end

Discharge port

Feed tube

Feed

Solids

Core control Adaptivetorquecontrol

Opencommunications

Data log Remote monitoring

Octopus Plus,processoptimization

Octopus Lite,activepolymercontrol

Cosmos,predictvemaintenance

Basic core controller

Extended core controller

ALDEC G2-120 7500 mm (296 inch)

Max.1500mm(59inch)

2110 mm (83 inch)

Max.1600mm(63inch)

ALDEC G2-60 4550 mm (180 inch)

ALDEC G2-70 5000 mm (197 inch)

ALDEC G2-80 5035 mm (224 inch)

ALDEC G2-100 5665 mm (236 inch)

1110 mm (44 inch)

1110 mm (44 inch)

1200 mm (47 inch)

1300 mm (51 inch)

Max.1791mm(71inch)